The present invention relates to a method for preparing a catalyst, and in particular provides a method for preparing a catalyst suitable for the polymerisation of ethylene and/or propylene, said catalyst comprising a compound of yttrium, neodymium or scandium supported on a silica support, and wherein the method comprises: a) Treating a silica support by heating at a temperature of at least 550° C., b) Contacting the treated silica support with a complex of the following formula: D.sub.mMX.sup.1X.sup.2R wherein M is selected from Y, Sc and Nd, R is a hydrocarbyl group, X.sup.1 and X.sup.2 are anionic groups, D is a neutral donor group, and m is 0 or greater.

The present invention relates to a polymer composition, to an article comprising the polymer composition, preferably to an article which is a photovoltaic (PV) module comprising at least one layer element (LE) comprising the polymer composition and to a process for producing said article, preferably said photovoltaic (PV) module.

The present invention relates to a polymer composition, to an article comprising the polymer composition, preferably to an article which is a photovoltaic (PV) module comprising at least one layer element (LE) comprising the polymer composition and to a process for producing said article, preferably said photovoltaic (PV) module.

A resin composition comprises: a modified vinyl alcohol-based polymer (A) containing from 1 to 20 mol % of a structural unit represented by a formula (1) below; and a layered inorganic compound (B). Such a resin composition is excellent in water vapor barrier properties, recyclability, and productivity during coating.

##STR00001##

A resin composition comprises: a modified vinyl alcohol-based polymer (A) containing from 1 to 20 mol % of a structural unit represented by a formula (1) below; and a layered inorganic compound (B). Such a resin composition is excellent in water vapor barrier properties, recyclability, and productivity during coating.

##STR00001##

Described herein are modified thermoplastic polyurethanes, methods of reactively extruding the modified thermoplastic polyurethanes, and methods of using the modified thermoplastic polyurethanes. The modified thermoplastic polyurethanes are mi-cro-crosslinked through reaction with a functional polyolefin, have significantly improved tensile strength and elongation compared to unmodified thermoplastic polyurethanes, and may be extruded.

Described herein are modified thermoplastic polyurethanes, methods of reactively extruding the modified thermoplastic polyurethanes, and methods of using the modified thermoplastic polyurethanes. The modified thermoplastic polyurethanes are mi-cro-crosslinked through reaction with a functional polyolefin, have significantly improved tensile strength and elongation compared to unmodified thermoplastic polyurethanes, and may be extruded.

An ethylene/tetrafluoroethylene copolymer satisfying the following formula (1), wherein peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a —CF.sub.2H group, a —CF.sub.2CH.sub.2COF group, a —COF group, a —COOH group, a dimer of a —CF.sub.2COOH group and a monomer of a CF.sub.2CH.sub.2COOH group, a —COOCH.sub.3 group, a —CONH.sub.2 group, and a —CH.sub.2OH group satisfy the following formula (2):
75≤tan δ(60)/tan δ(5)×100≤225  (1)
PI.sub.A/(PI.sub.B+PI.sub.C+PI.sub.D+PI.sub.E+PI.sub.F+PI.sub.G+PI.sub.H)≥0.60  (2) wherein tan δ(60), tan δ(5), PI.sub.A, PI.sub.B, PI.sub.C, PI.sub.D, PI.sub.E, PI.sub.F, PI.sub.G and PI.sub.H are as defined in the specification. Also disclosed is a molded article obtained by molding the ethylene/tetrafluoroethylene copolymer and an electric wire including a core and a coat formed from the ethylene/tetrafluoroethylene copolymer.

An ethylene/tetrafluoroethylene copolymer satisfying the following formula (1), wherein peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a —CF.sub.2H group, a —CF.sub.2CH.sub.2COF group, a —COF group, a —COOH group, a dimer of a —CF.sub.2COOH group and a monomer of a CF.sub.2CH.sub.2COOH group, a —COOCH.sub.3 group, a —CONH.sub.2 group, and a —CH.sub.2OH group satisfy the following formula (2):
75≤tan δ(60)/tan δ(5)×100≤225  (1)
PI.sub.A/(PI.sub.B+PI.sub.C+PI.sub.D+PI.sub.E+PI.sub.F+PI.sub.G+PI.sub.H)≥0.60  (2) wherein tan δ(60), tan δ(5), PI.sub.A, PI.sub.B, PI.sub.C, PI.sub.D, PI.sub.E, PI.sub.F, PI.sub.G and PI.sub.H are as defined in the specification. Also disclosed is a molded article obtained by molding the ethylene/tetrafluoroethylene copolymer and an electric wire including a core and a coat formed from the ethylene/tetrafluoroethylene copolymer.

An ethylene/tetrafluoroethylene copolymer satisfying the following formula (1), wherein peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a —CF.sub.2H group, a —CF.sub.2CH.sub.2COF group, a —COF group, a —COOH group, a dimer of a —CF.sub.2COOH group and a monomer of a CF.sub.2CH.sub.2COOH group, a —COOCH.sub.3 group, a —CONH.sub.2 group, and a —CH.sub.2OH group satisfy the following formula (2):
75≤tan δ(60)/tan δ(5)×100≤225  (1)
PI.sub.A/(PI.sub.B+PI.sub.C+PI.sub.D+PI.sub.E+PI.sub.F+PI.sub.G+PI.sub.H)≥0.60  (2) wherein tan δ(60), tan δ(5), PI.sub.A, PI.sub.B, PI.sub.C, PI.sub.D, PI.sub.E, PI.sub.F, PI.sub.G and PI.sub.H are as defined in the specification. Also disclosed is a molded article obtained by molding the ethylene/tetrafluoroethylene copolymer and an electric wire including a core and a coat formed from the ethylene/tetrafluoroethylene copolymer.